Science & Tech 07-04-2020

• U-235 is fissile material and used in nuclear reactor but it is rarely found and need enrichment of natural uranium which contains only 0.7% of U-235.

Initially at start of heating from 0-degree Celsius to 4-degree Celsius. There will be a contraction as a result of which volume decreases. On further heating beyond 4-degree Celsius the molecules gain kinetic energy and start moving more randomly. Thus, intermolecular distance increase as a result of which its volume increases.

• E-LISA aims to measure gravitational waves in frequency range from 0.1 MHz to about 100 mHz.

• NPK fertilizers are mixed fertilizers. They provide all three essential nutrients (nitrogen, phosphorus and potassium.)

• Cocoa contains caffeine, carbonated water, glucose-fructose kola extract and caramel colour.